Question about 1984 Honda CBX

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I have purchased the 1984 Honda cbc 750F through ebay. The current engine in the bike has a primary drive tensioner, which is broken. I have sourced a second hand running engine, however don't have a manual as yet. Will it be easy to just swap the engines over. What's involved with this process?

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  • jason_wri590 Sep 11, 2009

    What's involved in swapping the engines over? Does it involve spitting the crank case etc?

  • jason_wri590 Sep 14, 2009

    Thanks for the reply.



    Then is it easy to take the engine from the gear box and replace the other engine.



    Thanks Jason.

  • jason_wri590 Sep 14, 2009

    Thanks for the reply. I will let u know how i go.

    Cheers Jason

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  • Honda Master
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If you know that the engine is good, then it is better to replace the tensioner.
If you are not sure about engine condition, then replace engine.

to replace the tensioner you will need to take off the
cover. Remove engine sprocket.
Undo the primary chain and clutch assembly alltogether.
Undo the starter bolts and jackshaft.
Replace the tensioner.

The job is pretty much similar to replacing the drive belt.

see also Replace Motorcycle Drive Belt Removed Cover Photo


Better doing the repair with the aid of a workshop manual, like the ones below:


HONDA CB750 NIGHTHAWK FACTORY SERVICE REPAIR MANUAL 1979-1984 .

Honda CB750, CB900 DOHC Fours 1978-1984 repair manual by Haynes

Posted on Sep 11, 2009

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  • Honda Master
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It is very easy to do this, all you need to do is remove a few long bolts that secure the engine in the bikes frame, disconnect the plug wires from plugs, disconnect the wiring to the alternator stator in the side case and disconnect fuel and carb linkages, u should have it out in about 1 hour.

Posted on Sep 11, 2009

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